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Intra-Subject Variability, Intelligence, and ADHD Traits in a Community-Based Sample
Yoanna Schulz-Zhecheva1, Manuel C Voelkle2, André Beauducel3
1University of Freiburg, Germany.
Objective:
The present study investigates the predictive validity of intra-subject variability (ISV) for ADHD traits in a community-based sample and the stability of the relationship between ISV and fluid intelligence (gf) across the continuum of ADHD traits.
Method:
Age-residualized data from 426 participants (8-18 years, 6% ADHD) was used to investigate whether ex-Gaussian and DDM parameters derived from simple choice-reaction-time tasks can predict continuously assessed ADHD traits. Multiple-Group-Analyses and Latent-Moderated-Structural-Equations were used to test whether ADHD traits moderate the relationship between ISV and gf.
Results:
σ and μ of the ex-Gaussian model as well as DDM parameters drift rate (v) and boundary separation (a) significantly predicted general ADHD traits, while τ predicted attention difficulties specifically. Across the ADHD continuum, σ and v were significant predictors of gf.
Conclusion:
The results confirm the link between ISV and ADHD. The relationship between ISV and gf appears stable across the ADHD continuum.
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